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backlight: Add driver for iPAQ micro backlight

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This adds a driver for the backlight controlled by the microcontroller
on the Compaq iPAQ series of handheld computers: h3100, h3600
and h3700.

Acked-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Linus Walleij 2014-07-24 18:17:49 +02:00 committed by Lee Jones
parent ff9c5422d8
commit 2188a988bb
3 changed files with 93 additions and 0 deletions
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9
drivers/video/backlight/Kconfig
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@ -207,6 +207,15 @@ config BACKLIGHT_GENERIC
known as the Corgi backlight driver. If you have a Sharp Zaurus
SL-C7xx, SL-Cxx00 or SL-6000x say y.
config BACKLIGHT_IPAQ_MICRO
tristate "iPAQ microcontroller backlight driver"
depends on MFD_IPAQ_MICRO
default y
help
Say y to enable the backlight driver for Compaq iPAQ handheld
computers. Say yes if you have one of the h3100/h3600/h3700
machines.
config BACKLIGHT_LM3533
tristate "Backlight Driver for LM3533"
depends on BACKLIGHT_CLASS_DEVICE

1
drivers/video/backlight/Makefile
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@ -36,6 +36,7 @@ obj-$(CONFIG_BACKLIGHT_GENERIC) += generic_bl.o
obj-$(CONFIG_BACKLIGHT_GPIO) += gpio_backlight.o
obj-$(CONFIG_BACKLIGHT_HP680) += hp680_bl.o
obj-$(CONFIG_BACKLIGHT_HP700) += jornada720_bl.o
obj-$(CONFIG_BACKLIGHT_IPAQ_MICRO) += ipaq_micro_bl.o
obj-$(CONFIG_BACKLIGHT_LM3533) += lm3533_bl.o
obj-$(CONFIG_BACKLIGHT_LM3630A) += lm3630a_bl.o
obj-$(CONFIG_BACKLIGHT_LM3639) += lm3639_bl.o

83
drivers/video/backlight/ipaq_micro_bl.c Normal file
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@ -0,0 +1,83 @@
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* iPAQ microcontroller backlight support
* Author : Linus Walleij <linus.walleij@linaro.org>
*/
#include <linux/backlight.h>
#include <linux/err.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/mfd/ipaq-micro.h>
#include <linux/module.h>
#include <linux/platform_device.h>
static int micro_bl_update_status(struct backlight_device *bd)
{
struct ipaq_micro *micro = dev_get_drvdata(&bd->dev);
int intensity = bd->props.brightness;
struct ipaq_micro_msg msg = {
.id = MSG_BACKLIGHT,
.tx_len = 3,
};
if (bd->props.power != FB_BLANK_UNBLANK)
intensity = 0;
if (bd->props.state & (BL_CORE_FBBLANK | BL_CORE_SUSPENDED))
intensity = 0;
/*
* Message format:
* Byte 0: backlight instance (usually 1)
* Byte 1: on/off
* Byte 2: intensity, 0-255
*/
msg.tx_data[0] = 0x01;
msg.tx_data[1] = intensity > 0 ? 1 : 0;
msg.tx_data[2] = intensity;
return ipaq_micro_tx_msg_sync(micro, &msg);
}
static const struct backlight_ops micro_bl_ops = {
.options = BL_CORE_SUSPENDRESUME,
.update_status = micro_bl_update_status,
};
static struct backlight_properties micro_bl_props = {
.type = BACKLIGHT_RAW,
.max_brightness = 255,
.power = FB_BLANK_UNBLANK,
.brightness = 64,
};
static int micro_backlight_probe(struct platform_device *pdev)
{
struct backlight_device *bd;
struct ipaq_micro *micro = dev_get_drvdata(pdev->dev.parent);
bd = devm_backlight_device_register(&pdev->dev, "ipaq-micro-backlight",
&pdev->dev, micro, &micro_bl_ops,
&micro_bl_props);
if (IS_ERR(bd))
return PTR_ERR(bd);
platform_set_drvdata(pdev, bd);
backlight_update_status(bd);
return 0;
}
struct platform_driver micro_backlight_device_driver = {
.driver = {
.name = "ipaq-micro-backlight",
},
.probe = micro_backlight_probe,
};
module_platform_driver(micro_backlight_device_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("driver for iPAQ Atmel micro backlight");
MODULE_ALIAS("platform:ipaq-micro-backlight");